I'm very interested in this book... Out of curiosity, which book version do you have? It's pretty pricey too, even for the kindle version.

tbh, I pirated it on Library genesis:
http://gen.lib.rus.ec/search.php?req=merovingian+kingdoms&lg_topic=libgen&open=0&view=simple&res=25&phrase=1&column=def

I'm too poor to buy many books (currently unemployed), and downloading it on the net saves me the hassle of borrowing it from my university library, so I don't have a bad conscience about it.

A Luminous Blue Variable star is a massive evolved star that shows an unpredictable and sometimes dramatic variation in both spectra and brightness. (They are also known as S Doradus variables, after S Doradus, one of the brightest stars of the Large Magellanic Cloud.)

The definitive LBV star is Eta Carinæ (formerly Eta Argus of the Argos Navis superordinal constellation — as it was known to John Hershel when he observed the beginnings of the Great Eruption, 1837–48).

The Great Eruption
Lasting 110 years, the Great Eruption has been hypothesized to be the result of a collision between this 100 solar mass LBV visible star and possibly a second companion (leaving the third companion, a 30 solar mass star, in the resultant binary system).

During the Great Eruption Eta Carinæ blazed from magnitude 14, past Orion’s 0.13 magnitude (this was a mass ejection estimated at 10–40 solar masses), to eventually peak second only in the visible sky to Sirius, in 1843. Today it is magnitude 4.5 (at 7500 lightyears distant).

The Lidov-Kozai mechanism
Recently this was explained by Michail Lidov & Yoshihide Kozai as being when a triplet star system is unbalanced by their third member’s highly inclined orbit (i.e., >10°), at a distance of 25AU from the binary (orbiting only 1AU from each other every 5½ years).

Dr Simon Portegies Zwart (Ledien University) & Dr Edwin van den Heuvel (Amsterdam University) posited that a tidal-lock for the two close companions would minimized the orbital variation for Eta Carinæ (and so taking more than 3 million years instead of merely a few hundreds of thousands, hence it would be visible at the time it was seen and not millions of years ago when the constellation coalesced).

confer Wolf-Rayet star classification.

credit: Keith Cooper, Great Southern Star, Australian Sky & Telescope issue 97, volume 12, number 8 (November 2016), pp.36–40.

A reminder that the author gets a bit of royalty if you borrow from a library.

I very much doubt that (who would pay for that, especially since I don't pay a library fee? Royalties depend on books sold, not borrowed), and no historian will get much income from books (especially ones aimed at primarily a specialist audience) anyway.
So no reason for lawcuckery.

Libraries DO pay every time a book is lent.
https://de.wikipedia.org/wiki/Bibliothekstantieme

I am also very poor and read a lot without the poor authors getting any royalties for it. My intention was not to start a fight.

Ok, I didn't know that, thanks.
I doubt it matters much for that kind of book though (3-4 cent...well, there would have to be a surprising amount of people interested in Merovingians to generate any income from that), probably more relevant for popular novelists and scientific handbooks.

Article: Wo die "Anstalt" nicht nur aufklaert, sondern Wirkung zeigt: als Kontaktboerse von Leiharbeitern und Arbeitsrechtlern

The Chaos Imperative
by Ori Brafman

Rolling Blackouts: Dispatches from Turkey, Syria, and Iraq by Sarah Glidden.

Moreeni by Lauri Viita.

Carsick by John Waters

"The Fog" by James Herbert

Uwikłanie
by Zygmunt Miloszewski

Currently, Shogun by James Clavell. I'm trying to get into the "Asian Saga".